refactor(contracts): source control provider kind is an open branded slug

[juliusmarminge]

SourceControlProviderKind was a closed literal union in @t3tools/contracts. Every client switch over it was exhaustive by construction, and adding a host meant editing the contract. This is the first layer of a stack that replaces the client-side kind switches with per-host client definitions.

Fix. The kind is now an open branded slug (TrimmedNonEmptyString, lowercase [a-z][a-z0-9-]*, max 64), the same shape as ProviderDriverKind. A server can report a host the client does not ship, and it still decodes. Every hosted string that existed before still decodes unchanged.

• Construction sites with a literal kind go through SourceControlProviderKind.make(...). Most of the diff is test fixtures.
• The two exhaustive switches over the kind (resolveChangeRequestPresentation, pullRequestCheckoutCommand) now take their unknown result as the default branch.
• The temporary local unions in web and client-runtime (the Add Project and Publish pickers) stay string unions and convert at the RPC boundary. The next layers replace them with definition lookups.

No behavior change.

Verification

• npx tsc --noEmit -p . is clean in contracts, shared, client-runtime, all seven source-control-* packages, server, web, mobile and desktop.
• vp test run passes on the 20 touched non-server test files (642 tests).
• The server test files I touched pass, plus apps/server/src/sourceControl (17 files, 567 tests). These ran under unshare -U --map-current-user -p -f --mount-proc.
• vp lint on the touched files reports 0 errors.
• Effect-shortcut grep over the added lines finds nothing.

Restacked onto main after GitCafe (#17681) landed. GitCafe's server package and its tests needed the same SourceControlProviderKind.make("gitcafe") treatment. Its new case "gitcafe" in resolveChangeRequestPresentation is kept ahead of the default arm. packages/source-control-gitcafe typechecks, and its tests plus the server source-control, pull-request, git and project tests pass (27 files, 617 tests).

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Approved at ed22e11

Macroscope's review found this PR approvable — This is a backwards-compatible contract refactor that broadens provider-kind decoding to validated branded slugs while preserving existing provider behavior and generic fallbacks. The large file count is predominantly mechanical call-site and test-fixture migration, with no product-default, deployment, security, or static-analysis changes.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	20.9 KiB	20.9 KiB	0 B (0.0%)	29.3 KiB	✅
Codex	Live turn messages	2	2	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.2 KiB	21.2 KiB	0 B (0.0%)	29.3 KiB	✅
Claude	Live turn messages	2	2	0 (0.0%)	8	✅

Baseline: dacd2cb · PR result: ed22e11 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6c6a5b2 and ed22e11.

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📒 Files selected for processing (4)

• apps/server/src/git/GitManager.ts
• apps/web/src/components/GitActionsControl.tsx
• packages/contracts/src/pullRequest.ts
• packages/source-control-github/src/server/GitHubSourceControlProvider.test.ts

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📝 Walkthrough

Walkthrough

The pull request changes SourceControlProviderKind from a fixed set of provider names to a validated branded string. It updates shared, server, and client code to construct provider-kind values with SourceControlProviderKind.make. Related test fixtures use the constructed values.

Changes

Source-Control Provider Kind

Layer / File(s)	Summary
Provider-kind contract and shared handling packages/contracts/src/sourceControl.ts, packages/contracts/src/pullRequest.ts, packages/shared/src/sourceControl.ts, packages/shared/src/*test.ts	SourceControlProviderKind now accepts trimmed lowercase slugs up to 64 characters. Pull-request requirement lookup uses a map. Shared detection and presentation code constructs provider-kind values.
Server provider values and service integration apps/server/src/**, packages/source-control-*/src/server/*	Server services and provider adapters construct provider kinds for metadata, errors, routing, and repository operations. Related server test fixtures use constructed values.
Client provider selection and fixtures apps/mobile/src/**, apps/web/src/**, packages/client-runtime/src/**	Client lookup, publishing, discovery, and host-resolution code constructs provider-kind values. Provider-selection types and related fixtures are updated.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Refactor

Suggested reviewers: maria-rcks

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Merge Risk: ⚪ Minimal · up to ed22e

The provider requirement lookup now handles unknown provider kinds without confusing them with inherited object properties. No merge-blocking risk remains in the reviewed changes.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title is concise, conventional, and accurately describes the main change: making the source-control provider kind an open branded slug.
Description check		The description clearly explains the problem, implementation, compatibility impact, scope, and detailed verification results. It does not use the template headings or provide explicit maintainer appro…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @packages/contracts/src/pullRequest.ts:
- Line 1305: Update pullRequestProviderRequirement to check that provider is an
own key of PROVIDER_REQUIREMENT before reading its value; treat inherited keys
such as "constructor" as unknown providers and return null.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2f6a68c and 6c6a5b2.

📒 Files selected for processing (17)

• apps/server/src/pullRequest/PullRequestService.test.ts
• apps/server/src/pullRequest/PullRequestService.ts
• apps/server/src/sourceControl/SourceControlDiscovery.test.ts
• apps/server/src/sourceControl/SourceControlProviderRegistry.test.ts
• apps/web/src/components/CommandPalette.tsx
• apps/web/src/components/GitActionsControl.tsx
• apps/web/src/components/ThreadStatusIndicators.tsx
• apps/web/src/components/pullRequest/pullRequestDetail.logic.ts
• apps/web/src/components/settings/SourceControlSettings.tsx
• apps/web/src/state/sourceControlActions.ts
• packages/contracts/src/pullRequest.ts
• packages/contracts/src/sourceControl.ts
• packages/shared/src/sourceControl.ts
• packages/source-control-gitcafe/src/server/GitCafePullRequestProvider.ts
• packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.test.ts
• packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.ts
• packages/source-control-gitcafe/src/server/driver.ts

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